Strongs:

5043 τεκνον teknon tek'-non from the base of 5098; TDNT-5:636,759; n n AV-child 77, son 21, daughter 1; 99 1) offspring, children 1a) child 1a) a male child, a son 1b) metaph. 1b1) the name transferred to that intimate and reciprocal relationship formed between men by the bonds of love, friendship, trust, just as between parents and children 1b2) in affectionate address, such as patrons, helpers, teachers and the like employ: my child 1b3) in the NT, pupils or disciples are called children of their teachers, because the latter by their instruction nourish the minds of their pupils and mould their characters 1b4) children of God: in the OT of "the people of Israel" as especially dear to God, in the NT, in Paul's writings, all who are led by the Spirit of God and thus closely related to God 1b5) children of the devil: those who in thought and action are prompted by the devil, and so reflect his character 1c) metaph. 1c1) of anything who depends upon it, is possessed by a desire or affection for it, is addicted to it 1c2) one who is liable to any fate 1c2a) thus children of a city: it citizens and inhabitants 1c3) the votaries of wisdom, those souls who have, as it were, been nurtured and moulded by wisdom 1c4) cursed children, exposed to a curse and doomed to God's wrath or penalty

3813-refers exclusively to little children 3808-refers to a child up to his first school years 3816-refers to a child of any age 3814-refers to late childhood and early youth